Stop motion for textile materials



Nov. 13, 196 R. BONEL 3,063,229

STOP MOTION FOR TEXTILE MATERIALS Filed July 28, 1961 2 Sheets-Sheet 1 Nov. 13, 1962 R. BONEL 3,063,229

STOP MOTION FOR TEXTILE MATERIALS Filed July 28, 1961 2 Sheets-Sheet 2 duced by the feed cylinder.

: of said invention. In said drawings:

United States Patent f bility Filed July 28, 1961, Ser. No. 127,653 Claims priority, application France Aug. 12, 1960 Claims. (CI. 5784) My invention has for its object a stop motion for textile materials, chiefly intended for continuously operating twisting frames.

It is a well-known fact that such stop motions inserted between the thread-feeding cylinder and the twisting spindle are intended to cut off the operation of the feed system as soon as a thread breaks. All prior arrangements of this type have a drawback in that the end of the broken thread is allowed to hang, so that the thread remains in the vicinity of the other threads during the twisting operation and it may occur that it runs into them.

The object of the present invention is to provide a stop motion which reliably eliminates the above-mentioned drawback of known arrangements.

To this end, the invention has for its object a stop mo tion for thread-feeding means in textile machines, which means include a feed cylinder and a presser roller associated with a thread-guiding arm pivotally secured to the pin carrying the presser roller and urged, on the one hand, towards its operative position by the traction exerted by the thread and, on the other hand, towards its rear position by an opposing return force furthered after a predetermined angular movement by a positive drive pro- Now, according to the invention, the pin carrying the roller is stationary in space and the thread-guiding arm carries a frictional member coaxial with the roller. This frictional member is made of an elastic material, and has a diameter which is slightly larger than that of the roller, while its length and its peripheral position are such that the driving contact between the feed cylinder and said member begins as soon as the return force causes the thread-guiding arm to pivot and said contact remains operative until said arm has executed a pivotal movement such that the end of the broken thread has been urged rearwardly so as to prevent its running into the other threads.

Through this arrangement, each time the thread is broken between the thread-feeding means and the twisting spindle, the hanging end of the broken thread is rejected suddenly rearwardly away from the adjacent threads which are being twisted in a manner such that no running in is any more possible.

The invention will be better understood upon reading of the following description and examination of the accompanying drawings illustrating by way of example and by no means in a limiting sense a preferredembodiment FIG. 1 is a side view of a stop motion 'ofa twisting mill according to the invention. 7

FIG. 2' is a cross-section through line II--II of FIG. 1. FIG. 3 is a side view of the side of the arm of the stop motion alone facing away from the side shown in FIG. 1. FIG. 4 is a cross-section through line IV-IV of FIG. 3. FIG. 5 is a view similar to FIG. 1 and illustrates the arrangement after the release following the breaking of the thread.

In FIGS. 1 and 2 is shown a roller 1 urging a thread '2 against a feed cylinder 3 which is continuously driven rotatably in operation.

The stop motion includes an arm 5 made, for example, of plastic material such as the superpolyamidic material sold under the registered trade name Nylon. The arm 5 is freely revolvable on a pin 6 carrying the roller 1 and is urged normally against a stop bar 7 by the tractional stress or pull exerted by the thread 2 passing through a thread guide 8 secured to the end of a rod 9 rigid with the arm 5. The thread guide 8 is provided at its front end with a slot 8a and serves as a substitute for the conventional pig tail guide.

The thread 2 is fed from a creel, which is not illustrated, and passes first over a horizontal thread guide 10 and then, a first time, between the roller 1 and the cylinder 3 and around the roller and then passes over a vertical guide 11 on which it forms a loop and then, finally, it again passes a second time between the roller 1 and the cylinder 3 before it passes out of the stop motion system over the guide 8 and along a line registering with the axis of a spindle B of the textile machine or twisting frame.

The arm 5 is urged into angular movement about the axis of the roller in the direction of the arrow i1 under the action of a small eccentric weight 13 (see also FIG. 4) rigid with the arm 5.

The arm 5 moreover carries a driving covering member, or segment, 15 made, in the example illustrated by a portion of a rubber ring threaded over a boss 16 of the arm. The size of the covering member is such that the outer surface of the ring is coaxial with the roller 1 and its diameter is slightly larger than the diameter of the latter. This driving segment extends over an arc of about one half the circumference of the roller and lies immediately to the rear of the point of contact between the roller and the feed cylinder when the arm 5 occupies the position illustrated in FIG. 1, which corresponds to a normal twisting operation. The covering member has for its object to make the arm 5 pivotsuddenly upwardly and rearwardly as soon as its pivotal movement is initiated at the moment of the breaking of a thread, as provided by the contacting between said covering member and the surface of the thread-feeding cylinder 3.

' In order to stop the drive of the thread through the feeding means when the thread is broken, there is proyided a tongue 18 formed by a segment of a cylindrical surface coaxial with the roller 1 and secured to the arm 5.

The tongue is made of a material having a high coefficient of friction, for example fibre, so that the thread may not have a tendency to slide over it when the tongue engages the thread.

' When the twisting frame is' stopped, there is provided, in order to prevent any rising movement of the arm 5 of the stop motion, a brake shoe 21 having an arcuate recess as shown adapted to engage the member 15. The brake shoe is pivotally secured to a rod 22 extending throughout the length of the twisting frame. The shoe 21 is mounted loosely on the rod and carries a small weight 24 which has a tendency to make it pivot on rod 22 in the direction of the arrow f2, which corresponds to the direction of application of the shoe against the member 15.

During normal operation of the twisting frame, the arm 5 is ina released condition and, consequently, the shoe 21 is spaced away from the segment 15. To this end, there is secured to the rod- 22 and in registry with each of the shoes 21 a lug 25 held fast, for instance by a set-screw 26. The lug is adapted to cooperate with a stud 27 rigid with the shoe 21. Upon the rod 22 pivoting in a direction opposed to the arrow f2, the. stud rises under the action of the lug 25 and, consequently, the shoe 21 is urged away from the cooperating member 15.

The operation of the stop motion is as follows:

For normal operation of the twisting frame, as illustrated in FIG. 1, the tensioning of the thread 2 holds the arm 5 in contact with the stop bar 7.

One of the ends of the driving friction segment 15 is then located a few millimeters to the rear, with reference to the direction of the arrow f1, of the point of contact between the roller 1 and the thread-feeding cylinder, while its other end lies at the upper end.

If a thread breaks, the reaction produced by the breaking, is that the stress exerted by the weight 13 and the: rotary motion of the roller 1 initiate immediately a pivota1 movement of the lever in the direction of the arrow f1. Immediately afterwards, the corresponding front end of the driving member 15 reaches the thread-feeding cylinder and produces thereby a sudden rise of the lever 5 which executes a half revolution and occupies the position illustrated in FIG. 5 for which the other end of the driving member 15 reaches a position beyond the thread-feeding cylinder, while the tongue 18 is inserted between the thread-fading cylinder and the roller and prevents thus any advancement of the thread.

The free end 2a of the broken thread hangs down from the thread guide 8 now at the rear of the Whole system; in other words, it is spaced with reference to the other threads during the twisting operation, which eliminates any possibility of its running into the other threads.

The arrangement described has a very simple structure and is readily adaptable on existing twisting frames.

In contradistinction with the operation of the stop motions proposed hitherto, the efficiency of the improved arrangement increases when the twist is less marked, since its speed of movement increases with the speed of feed.

The positive drive of the arm of the stop motion by the driving segment in contact with the thread-feeding cylinder ensures a positive rise of the arm and a very speedy release of the stop motion.

Obviously, the present invention is by no means limited to the sole embodiment disclosed and illustrated merely by way of exemplification, and any one skilled in the art may bring thereto a large number of modifications, without thereby unduly widening the scope of the invention as defined in the accompanying claims.

I claim:

1. In a textile machine including a driven thread-feeding cylinder and a presser roller disposed parallel with each other and having cooperating peripheral surfaces fed with a thread therebetween, and the same wound over said roller, a stop motion comprising a pivot, a threadguiding arm pivotally mounted coaxially with said roller and having guide means spaced radially from said pivot to guide the thread from the roller over the end of the arm to the textile machine, the tensioning of the thread urging the arm into a first predetermined angular position in which said arm faces in a given direction, means constantly urging the arm away from said predetermined position into another angular position in which said arm faces away from said given direction, an elastic friction member fixed on said arm and provided with an arcuate surface coaxial with the roller and having an outside diameter slightly larger than that of said roller, said arcuate surface of the friction member extending angularly a distance equal to over one half the circumference of said roller, said friction member having an edge terminating said arcuate surface disposed adjacent a line of contact of said roller and cylinder and on a side of a plane passing through said rollers opposite to a side of said plane in which said arm is disposed when extending in said given direction, said arcuate surface being disposed to engage with said driven cylinder when said arm is actuated toward said other angular position by said means urging said arm to said other angular posi tion, whereby said friction member is driven by the cylinder upon release of the arm by a broken thread and initiates an accelerated angular movement of said arm to cause said arm to carry along with it a broken end of said thread to said other angular position.

2. In a textile machine including a driven thread-feeding cylinder and a presser roller disposed parallel with each other and having cooperating peripheral surfaces fed with a thread therebetween, and the same wound over said roller, a stop motion comprising a pivot on which the presser roller is revolvably carried, a threadguiding arm pivotally mounted on said roller pivot and having guide means spaced radially from said pivot to guide the thread from the roller over the end of the arm to the textile machine, the tensioning of the thread urging the arm into a predetermined angular position in which the arm faces the textile machine, means urging the arm away from said predetermined position into another angular position in which the arm faces away from the textile machine, an elastic friction member fixed on said arm and provided with an arcuate surface coaxial with the roller and having an outside diameter slightly larger than that of said roller, said arcuate surface of the friction member extending angularly a distance equal to over one half the circumference of said roller, said friction member having an edge terminating said arcuate surface disposed adjacent a line of contact of said roller and cylinder and on a side of a plane passing through said rollers opposite to a side of said plane in which said arm is disposed when extending in said given direction, said arcuate surface being disposed to engage with said driven cylinder when said arm is actuated toward said other angular position by said means urging said arm to said other angular position, whereby said friction member is driven by the cylinder upon release of the arm by a broken thread and initiates an accelerated angular movement of said arm to cause said arm to carry along with it a broken end of said thread to the other angular position, and a brake member movable into engagement with the friction member when said machine is stopped to hold the arm is said predetermined position against angular movement for rendering the stop motion inoperative.

3'. In a textile machine including a driven thread-feeding cylinder and a presser roller disposed parallel with each other and having cooperating peripheral surfaces fed with a thread therebetween, and the same wound over said roller, a stop motion comprising a pivot on which the presser roller is revolvably carried, a thread-guiding arm pivotally mounted on said roller pivot and having guide means spaced radially from said pivot to guide the thread from the roller over the end of the arm to the textile machine, the tensioning of the thread urging the arm into a predetermined angular position in which the arm faces the textile machine, means urging the arm away from said predetermined position into another angular position in which the arm faces away from the textile machine, an elastic friction member fixed on said arm and provided with an arcuate surface coaxial with the roller and having an outside diameter slightly larger than that of said roller, said arcuate surface of the friction member extending angularly a distance equal to over one half the circumference of said roller, said friction member having an edge terminating said arcuate surface disposed adjacent a line of contact of said roller and cylinder and on a side of a plane passing through said rollers opposite to a side of said plane in which said arm is disposed when extending in said given direction, said arcuate surface being disposed to engage with said driven cylinder when said arm is actuated toward said other angular position by said means urging said arm to said other angular position, whereby said friction member is driven by the cylinder upon release of the arm by a broken thread and initiates an accelerated angular movement of said arm to cause said arm to carry along with it a broken end of said thread to the other angular position, and an arcuate tongue of a material having a high frictional coetficient carried by the thread-guiding arm and disposed to engage between the cylinder and the roller when said arm assumes said other angular position, thereby to prevent feeding of said broken end of the thread by said cylinder and roller.

4. In a textile machine including a driven thread-feeding cylinder and a presser roller disposed parallel with each other and having cooperating peripheral surfaces fed with a thread therebetween, and the same wound over said roller, a stop motion comprising, a pivot on which the presser roller is revolvably carried, a threadguiding arm pivotally mounted on said roller pivot and having guide means spaced radially from said pivot to guide the thread from the roller over the end of the arm to the textile machine, the tensioning of the thread urging the arm into a predetermined angular position in which the arm faces the textile machine, means urging the arm away from said predetermined position into another angular position in which the arm faces away from the textile machine, an elastic friction member fixed on said arm and provided with an arcuate surface coaxial with the roller and having an outside diameter slightly larger than that of said roller, said arcuate surface of the friction member extending angularly a distance equal to over one half the circumference of said roller, said friction member having an edge terminating said arcuate surface disposed adjacent a line of contact of said roller and cylinder and on a side of a plane passing through said rollers opposite to a side of said plane in which said arm is disposed when extending in said given direction, said arcuate surface being disposed to engage with said driven cylinder when said arm is actuated toward said other angular position by said means urging said arm to said other angular position, whereby said friction member is driven by the cylinder upon release of the arm by a broken thread and initiates an accelerated angular movement of said arm to cause said arm to carry along with it a broken end of said thread to the other angular position, and an arcuate tongue of a material having a high frictional coefficient carried by the thread-guiding arm and disposed extending over a fraction of the periphery of the roller to engage between the cylinder and the roller when said arm assumes said other angular position, thereby to prevent feeding of said broken end of the thread by said cylinder and roller.

5. In a textile machine provided with operative spindles and including a driven thread-feeding cylinder and a presser roller disposed parallel with each other and having cooperating peripheral surfaces fed with a thread therebetween, and the same wound over said roller, a stop motion comprising a pivot on which the presser roller is revolvably carried, a thread-guiding arm pivotally mounted on said roller pivot and having guide means spaced radially from said pivot to guide the thread from the roller over the end of the arm along a line registering with the axis of a spindle of the textile machine, the tensioning of the thread urging the arm into a predetermined angular position in which the arm faces the textile ma chine, means urging the arm away from said predetermined position into another angular position in which the arm faces away from the textile machine, an elastic friction member fixed on said arm and provided with an arcuate member coaxial with the roller and having an outside diameter slightly larger than that of said roller, said arcuate surface of the friction member extending angularly a distance equal to over one half the circumference of said roller, said friction member having an edge terminating said arcuate surface disposed adjacent a line of contact of said roller and cylinder and on a side of a plane passing through said rollers opposite to a side of said plane in which said arm is disposed when extending in said given direction, sad arcuate surface being disposed to engage with said driven cylinder when said arm is actuated toward said other angular position by said means urging said arm to said other angular position, whereby said friction member is driven by the cylinder upon release of the arm by a broken thread and initiates an accelerated angular movement of said arm to cause said arm to carry along with it a broken end of said thread to the other angular position.

References Cited in the file of this patent UNITED STATES PATENTS 2,657,451 Solliday et a1. Nov. 3, 1953 

